White Cloud colors?

I just bought 3 white clouds and I noticed that they aren't very white but I came home tonight and took a peek into the tank and noticed that one is ghost white! I know the females are supposed to be lighter in color and I just want to make sure that she isn't sick or anything from changing colors so quickly! Does anyone know if this is normal?! (The other guys are a dark grey with a rosy red tail and a darker gray stripe. The white one has a faint stripe and no red color. My zebra danios keep harassing her so I hope she isn't getting ready to lay eggs.)
what is your tank size? zebra danios r schooling fish u have to keep at least 6 of them in a tank to reduce their fin nipping habit.
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